Mishimoto MMTC-JL-18SL Performance Transmission Cooler for 2018+ Jeep Wrangler JL

Whether you're cruising the highway or crawling a trail through Moab in your 2018+ Jeep Wrangler JL, keeping your transmission cool should be a priority.The 8-speed transmission mated to the 2018+ Wrangler JL makes it incredibly capable both on and off-road. But in both situations, the excellent ZF transmission could be let down by the stock transmission cooler. Poor airflow and a cramped cooling stack makes the stock transmission cooler the weak link in your JL's drivetrain, but Mishimoto has the solution.Mishimoto's performance transmission cooler for the 2018+ Jeep Wrangler JL is custom designed to extract every ounce of cooling capacity from the air passing through your JL's grille. Our transmission cooler features a 93-percent increase in external tube area and a 32-percent increase in external fin area to make sure that all of the air passing over the cooler is utilized.The Mishimoto transmission cooler also features unique fins within the tubes to add even more cooling surface area and make sure that all of the fluid is in contact with a cooling surface. This feature, combined with the 83-percent increase in fluid capacity, means that no matter how low the airflow is, your transmission will stay safe and cool.Like all Mishimoto 2018+ Jeep Wrangler JL products, this performance transmission cooler is backed by our Mishimoto Lifetime Warranty, so you'll never have to worry about an overheating transmission ruining your day on the trail or road trip ever again. Automatic transmission oil cooler designed to regulate fluid temperature and prevent overheating. Enhances transmission longevity, maintains performance, and features durable construction with a precise fit.

• 195-percent increase in internal fin surface area for comprehensive cooling in even the harshest conditions
• 93-percent increase in external tube area over stock transmission cooler
• 83-percent increase in fluid capacity over stock transmission cooler

Protect the transmission in your 2018 and newer Jeep Wrangler JL with the Mishimoto MMTC-JL-18SL Performance Transmission Cooler. Designed for the JL's 8-speed automatic transmission, this direct-fit cooler addresses the limitations of the factory unit, including restricted airflow and a crowded cooling stack. Whether your Wrangler is used for highway driving, trail exploration, or demanding off-road conditions, this automatic transmission oil cooler helps regulate fluid temperature, reduce overheating risk, and support consistent transmission performance.
The Mishimoto performance transmission cooler is engineered to maximize heat dissipation through the grille. It provides a 93-percent increase in external tube area and a 32-percent increase in external fin area compared with the stock transmission cooler, allowing more of the available airflow to be used for cooling. Internal fins within the tubes add further surface area and improve contact between the transmission fluid and the cooling surfaces, helping maintain safer fluid temperatures during demanding operation.
With an 83-percent increase in fluid capacity over the factory cooler and a 195-percent increase in internal fin surface area, the Mishimoto MMTC-JL-18SL is built to deliver dependable cooling when airflow is limited or operating conditions are severe. Its precise fit supports straightforward installation on compatible 2018+ Jeep Wrangler JL applications, while durable construction is designed for long-term use on the road and trail. Like other Mishimoto products for the Wrangler JL, this transmission cooler is backed by the Mishimoto Lifetime Warranty. Professional installation is recommended, and compatibility should be confirmed before purchase.

Features:

• Designed for 2018+ Jeep Wrangler JL models with an 8-speed automatic transmission

• 195-percent increase in internal fin surface area for enhanced cooling in demanding conditions

• 93-percent increase in external tube area compared with the stock transmission cooler

• 32-percent increase in external fin area for improved heat dissipation

• 83-percent increase in fluid capacity over the factory transmission cooler

• Internal tube fins increase cooling surface area and fluid-to-surface contact

• Helps regulate automatic transmission fluid temperature and reduce overheating risk

• Direct-fit design with durable construction for road and off-road use

• Backed by the Mishimoto Lifetime Warranty

Compatible With
2018 Jeep Wrangler
2019 Jeep Wrangler
2020 Jeep Gladiator
2020 Jeep Wrangler
2021 Jeep Gladiator
2021 Jeep Wrangler
2022 Jeep Gladiator
2022 Jeep Wrangler
2023 Jeep Gladiator
2023 Jeep Wrangler
2024 Jeep Gladiator
2024 Jeep Wrangler
2025 Jeep Gladiator
2025 Jeep Wrangler
2026 Jeep Gladiator
2026 Jeep Wrangler